I ended up watching DR3 since I realized I didn't care about being spoiled on games after the first, and it really felt like it was more fanservice to series fans than a show that could actually stand on its own, sadly.
It's kind of funny and sad how the bad guys look like they've got students that are pretty similar to the first games' Sakura, Mondo, Sayaka and Chihiro at the very least, which is quite underwhelming, and the fact that the despair part happens in the past means everything's doomed by canon, all while the journey to see how they all turned evil is apparently going to be answered with "they met Enojima" (except for the white haired guy, who's pretty evil right from the start). The knowledge that they will join Enojima later means that seeing Yukizono try to defend them feels tragic in a bad way... "this guy might've planned sabotaging and bombing, but if that's the case then that's more of a reason to keep him around! Oh, and let's expel the three second-year students while we're at it" was downright ridiculous, especially with how the blacksmith guy hadn't done a single thing wrong; maybe he could've dropped out to be with Ruruka, but being expelled because she and Seiko did ludicrously bad things that were later found out to be the work of a completely unrelated third party was weird as hell.
The whole Ruruka/Seiko thing is also weird as hell, since Ruruka appears to be an entirely self-centered girl who kept asking Seiko for favors that benefitted her "for the sake of their friendship", and the downright retarded balance of "you don't eat my sweets even though you have given me an entirely reasonable reason for not doing so... I hate you!". I was cringing really badly when I saw the whole laxative incident scene, since it was already painfully obvious that Ruruko was egotistical and didn't care about Seiko at all, so having her go on a rant about not being friends instead of trusting her words about it being a mix-up was a real pain. I actually expected Ruruko to be an agent of despair because of that, since with that ridiculously childish attitude of hers I'd rather not have her around a team of people fighting for good at all.
The plot so far has been little more than a retread of DR1's style, only littered with shoutouts to the games, and in-jokes aren't really selling me on the show at all since I care more about an interesting plot than just retreading DR1 and dropping lines about the guy going to scout Celeste and other fanservice I see as secondary to a decent plot that's just not there, neither in the despair nor future arcs so far.